Name:Funeral Room
ManaCost:2 B
Types:Enchantment Room
T:Mode$ ChangesZone | Origin$ Battlefield | Destination$ Graveyard | ValidCard$ Creature.YouCtrl | TriggerZones$ Battlefield | Execute$ TrigLoseLife | TriggerDescription$ Whenever a creature you control dies, each opponent loses 1 life and you gain 1 life.
SVar:TrigLoseLife:DB$ LoseLife | Defined$ Player.Opponent | LifeAmount$ 1 | SubAbility$ DBGainLife
SVar:DBGainLife:DB$ GainLife | Defined$ You | LifeAmount$ 1
AlternateMode:Split
Oracle:(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)\nWhenever a creature you control dies, each opponent loses 1 life and you gain 1 life.

ALTERNATE

Name:Awakening Hall
ManaCost:6 B B
Types:Enchantment Room
T:Mode$ UnlockDoor | ValidPlayer$ You | ValidCard$ Card.Self | ThisDoor$ True | Execute$ TrigChangeZone | TriggerDescription$ When you unlock this door, return all creature cards from your graveyard to the battlefield.
SVar:TrigChangeZone:DB$ ChangeZoneAll | ChangeType$ Creature.YouOwn | Origin$ Graveyard | Destination$ Battlefield
Oracle:(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)\nWhen you unlock this door, return all creature cards from your graveyard to the battlefield.